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  Forming individual magnetic biskyrmions by merging two skyrmions in a centrosymmetric nanodisk

Göbel, B., Henk, J., & Mertig, I. (2019). Forming individual magnetic biskyrmions by merging two skyrmions in a centrosymmetric nanodisk. Scientific Reports, 9: 9521. doi:10.1038/s41598-019-45965-8.

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https://doi.org/10.1038/s41598-019-45965-8 (Publisher version)
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Göbel, Börge1, Author              
Henk, Jürgen2, Author
Mertig, Ingrid1, Author
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1Max Planck Institute of Microstructure Physics, Max Planck Society, ou_2415691              
2External Organizations, ou_persistent22              

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 Abstract: When two magnetic skyrmions – whirl-like, topologically protected quasiparticles – form a bound pair, a biskyrmion state with a topological charge of NSk = ±2 is constituted. Recently, especially the case of two partially overlapping skyrmions has brought about great research interest. Since for its formation the individual skyrmions need to posses opposite in-plane magnetizations, such a biskyrmion cannot be stabilized by the Dzyaloshinskii-Moriya-interaction (DMI), which is the interaction that typically stabilizes skyrmions in non-centrosymmetric materials and at interfaces. Here, we show that these biskyrmions can be stabilized by the dipole-dipole interaction in centrosymmetric materials in which the DMI is forbidden. Analytical considerations indicate that the bound state of a biskyrmion is energetically preferable over two individual skyrmions. As a result, when starting from two skyrmions in a micromagnetic simulation, a biskyrmion is formed upon relaxation. We propose a scheme that allows to control this biskyrmion formation in nanodisks and analyze the individual steps.

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 Dates: 2019-07-02
 Publication Status: Published online
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 Identifiers: BibTex Citekey: P13746
DOI: 10.1038/s41598-019-45965-8
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Title: Scientific Reports
  Abbreviation : Sci. Rep.
Source Genre: Journal
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Publ. Info: London, UK : Nature Publishing Group
Pages: - Volume / Issue: 9 Sequence Number: 9521 Start / End Page: - Identifier: ISSN: 2045-2322
CoNE: https://pure.mpg.de/cone/journals/resource/2045-2322